EP 3753847 A4 20210414 - BLADE AIRFOIL FOR ROTARY-WING AIRCRAFT, BLADE HAVING SAID BLADE AIRFOIL, AND ROTARY-WING AIRCRAFT PROVIDED WITH SAID BLADE
Title (en)
BLADE AIRFOIL FOR ROTARY-WING AIRCRAFT, BLADE HAVING SAID BLADE AIRFOIL, AND ROTARY-WING AIRCRAFT PROVIDED WITH SAID BLADE
Title (de)
SCHAUFELBLATT FÜR DREHFLÜGELFLUGZEUG, SCHAUFEL MIT DIESEM SCHAUFELBLATT UND DREHFLÜGELFLUGZEUG MIT DIESER SCHAUFEL
Title (fr)
PROFIL AÉRODYNAMIQUE DE PALE POUR AÉRONEF À VOILURE TOURNANTE, PALE PRÉSENTANT LEDIT PROFIL AÉRODYNAMIQUE ET AÉRONEF À VOILURE TOURNANTE POURVU DE LADITE PALE
Publication
Application
Priority
- JP 2018087368 A 20180427
- JP 2019017327 W 20190424
Abstract (en)
[origin: EP3753847A1] In a rotary-wing aircraft blade airfoil included in a rotary-wing aircraft such as a helicopter, it is assumed that: a position of a rear end of a chord of the airfoil with respect to a front end of the chord is 100% chord; a position of a blade upper surface, the position being measured from the chord, is an upper blade height; and a position of a blade lower surface, the position being measured from the chord, is a lower blade height. The rotary-wing aircraft blade airfoil satisfies the following four conditions: a first airfoil condition, which is a condition that a blade thickness has its maximum value at a position within a range from 30% chord to 40% chord; a second airfoil condition, which is a condition that a camber has its maximum value at a position within a range from 15% chord to 25% chord, and that a slope of the camber changes from decreasing into increasing at a position within a range from 45% chord to 55% chord; a third airfoil condition, which is a condition that the upper blade height has its maximum value at a position within a range from 25% chord to 35% chord; and a fourth airfoil condition, which is a condition that the lower blade height has its maximum value at a position within a range from 35% chord to 45% chord.
IPC 8 full level
B64C 27/467 (2006.01)
CPC (source: EP US)
B64C 27/467 (2013.01 - EP US)
Citation (search report)
- [AD] US 4412664 A 19831101 - NOONAN KEVIN W [US]
- [A] US 4459083 A 19840710 - BINGHAM GENE J [US]
- [AD] US 4776531 A 19881011 - NOONAN KEVIN W [US]
- [A] GB 2138374 A 19841024 - UNITED TECHNOLOGIES CORP
- See references of WO 2019208602A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3753847 A1 20201223; EP 3753847 A4 20210414; EP 3753847 B1 20220316; JP 2019189184 A 20191031; JP 6626527 B2 20191225; US 2021237862 A1 20210805; WO 2019208602 A1 20191031
DOCDB simple family (application)
EP 19793810 A 20190424; JP 2018087368 A 20180427; JP 2019017327 W 20190424; US 202017075719 A 20201021